Finally, the court could always impose a fine in the amount of the “buy money.” In fact, 21 U.S.C. § 844(a) has its own special provisions for fines, which, among other things, provide that, upon conviction “a person who violates this subsection shall be fined the reasonable costs of the investigation and prosecution of the offense …, except that this sentence shall not apply and a fine under this section need not be imposed if the court determines under the provision of Title 18 that the defendant lacks the ability to pay.”